Mesoarchean Era

This is the third era in the Archean Eon.

In this era, the earliest life in oceans may have appeared, around 3-3.1 billion years ago. Oxygen levels dropped drastically for a few million years during this era, killing off some bacterial life on both land and sea.

The continent, Vaalbara, broke up around 2.8-2.9 billion years ago.